Sharp greenhood

Pterostylis acuminata has a rosette of between three and six dark green, oblong leaves, each leaf 10–40 mm (0.4–2 in) long and 8–20 mm (0.3–0.8 in) wide. A single green and white flower is borne on a flowering spike 150–250 mm (6–10 in) high. The flowers are 19–25 mm (0.7–1 in) long, 9–12 mm (0.4–0.5 in) wide and lean forward or "nod". The dorsal sepal and petals are joined and curve forward forming a hood over the column. The tip of the hood is sharply pointed and brownish. There is a broad, bulging gap in the sinus between the lateral sepals and a large gap between the lateral sepals and petals. The lateral sepals have thread-like tips 20–25 mm (0.8–1 in) long. The labellum protrudes through the sinus and is 14–16 mm (0.55–0.63 in) long, about 4 mm (0.2 in) wide, curved, reddish-brown and pointed. Flowering occurs between March and May.

The sharp greenhood grows in coastal forest and heath in Queensland and New South Wales. There is also an isolated population in far eastern Victoria.

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